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51c2a487 LPC |
1 | /* |
2 | * ADT7310/ADT7310 digital temperature sensor driver | |
3 | * | |
4 | * Copyright 2012-2013 Analog Devices Inc. | |
5 | * Author: Lars-Peter Clausen <lars@metafoo.de> | |
6 | * | |
7 | * Licensed under the GPL-2 or later. | |
8 | */ | |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/spi/spi.h> | |
13 | #include <asm/unaligned.h> | |
14 | ||
15 | #include "adt7x10.h" | |
16 | ||
17 | #define ADT7310_STATUS 0 | |
18 | #define ADT7310_CONFIG 1 | |
19 | #define ADT7310_TEMPERATURE 2 | |
20 | #define ADT7310_ID 3 | |
21 | #define ADT7310_T_CRIT 4 | |
22 | #define ADT7310_T_HYST 5 | |
23 | #define ADT7310_T_ALARM_HIGH 6 | |
24 | #define ADT7310_T_ALARM_LOW 7 | |
25 | ||
26 | static const u8 adt7310_reg_table[] = { | |
27 | [ADT7X10_TEMPERATURE] = ADT7310_TEMPERATURE, | |
28 | [ADT7X10_STATUS] = ADT7310_STATUS, | |
29 | [ADT7X10_CONFIG] = ADT7310_CONFIG, | |
30 | [ADT7X10_T_ALARM_HIGH] = ADT7310_T_ALARM_HIGH, | |
31 | [ADT7X10_T_ALARM_LOW] = ADT7310_T_ALARM_LOW, | |
32 | [ADT7X10_T_CRIT] = ADT7310_T_CRIT, | |
33 | [ADT7X10_T_HYST] = ADT7310_T_HYST, | |
34 | [ADT7X10_ID] = ADT7310_ID, | |
35 | }; | |
36 | ||
37 | #define ADT7310_CMD_REG_OFFSET 3 | |
38 | #define ADT7310_CMD_READ 0x40 | |
39 | ||
40 | #define AD7310_COMMAND(reg) (adt7310_reg_table[(reg)] << ADT7310_CMD_REG_OFFSET) | |
41 | ||
42 | static int adt7310_spi_read_word(struct device *dev, u8 reg) | |
43 | { | |
44 | struct spi_device *spi = to_spi_device(dev); | |
45 | int ret; | |
46 | ||
47 | ret = spi_w8r16(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ); | |
48 | if (ret < 0) | |
49 | return ret; | |
50 | ||
71bb2d21 | 51 | return be16_to_cpu((__force __be16)ret); |
51c2a487 LPC |
52 | } |
53 | ||
54 | static int adt7310_spi_write_word(struct device *dev, u8 reg, u16 data) | |
55 | { | |
56 | struct spi_device *spi = to_spi_device(dev); | |
57 | u8 buf[3]; | |
58 | ||
59 | buf[0] = AD7310_COMMAND(reg); | |
60 | put_unaligned_be16(data, &buf[1]); | |
61 | ||
62 | return spi_write(spi, buf, sizeof(buf)); | |
63 | } | |
64 | ||
65 | static int adt7310_spi_read_byte(struct device *dev, u8 reg) | |
66 | { | |
67 | struct spi_device *spi = to_spi_device(dev); | |
68 | ||
69 | return spi_w8r8(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ); | |
70 | } | |
71 | ||
72 | static int adt7310_spi_write_byte(struct device *dev, u8 reg, | |
73 | u8 data) | |
74 | { | |
75 | struct spi_device *spi = to_spi_device(dev); | |
76 | u8 buf[2]; | |
77 | ||
78 | buf[0] = AD7310_COMMAND(reg); | |
79 | buf[1] = data; | |
80 | ||
81 | return spi_write(spi, buf, sizeof(buf)); | |
82 | } | |
83 | ||
84 | static const struct adt7x10_ops adt7310_spi_ops = { | |
85 | .read_word = adt7310_spi_read_word, | |
86 | .write_word = adt7310_spi_write_word, | |
87 | .read_byte = adt7310_spi_read_byte, | |
88 | .write_byte = adt7310_spi_write_byte, | |
89 | }; | |
90 | ||
91 | static int adt7310_spi_probe(struct spi_device *spi) | |
92 | { | |
4b5e536b | 93 | return adt7x10_probe(&spi->dev, spi_get_device_id(spi)->name, spi->irq, |
51c2a487 LPC |
94 | &adt7310_spi_ops); |
95 | } | |
96 | ||
97 | static int adt7310_spi_remove(struct spi_device *spi) | |
98 | { | |
4b5e536b | 99 | return adt7x10_remove(&spi->dev, spi->irq); |
51c2a487 LPC |
100 | } |
101 | ||
102 | static const struct spi_device_id adt7310_id[] = { | |
103 | { "adt7310", 0 }, | |
104 | { "adt7320", 0 }, | |
105 | {} | |
106 | }; | |
107 | MODULE_DEVICE_TABLE(spi, adt7310_id); | |
108 | ||
109 | static struct spi_driver adt7310_driver = { | |
110 | .driver = { | |
111 | .name = "adt7310", | |
112 | .owner = THIS_MODULE, | |
113 | .pm = ADT7X10_DEV_PM_OPS, | |
114 | }, | |
115 | .probe = adt7310_spi_probe, | |
116 | .remove = adt7310_spi_remove, | |
117 | .id_table = adt7310_id, | |
118 | }; | |
119 | module_spi_driver(adt7310_driver); | |
120 | ||
121 | MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); | |
122 | MODULE_DESCRIPTION("ADT7310/ADT7320 driver"); | |
123 | MODULE_LICENSE("GPL"); |